The multiplex-bands absorption of sandwich-structure metamaterials based metal- dielectric- metal scheme are
investigated numerically and experimentally. The optical properties of cross-shape antenna perfect absorber metamaterials are demonstrated in mid-IR electromagnetic (EM) wave. The dual-band perfect absorber with polarization
independence is observed under normal incidence. In order to understand the EM properties of dual-band perfect absorber, the plasmonic excitation and the induced current distribution were clarified for both peaks. The simulation results clearly show that the absorption bands are independently governed by the size of each part of the patterned
nanostructure. The repositioning of two near-perfect absorption peaks possesses a linear relationship. This allows for a
flexible reconfigurability over the entire near-infrared regime. Furthermore, in order to obtain multiplex-bands spectral
absorption response, two cross-shape antennas are connected to form one dumbbell antenna. The three perfect-absorption peaks can be controlled by the individual dipole antenna elements in the conditions of polarization incident EM wave.